Question

Sally bought three chocolate bars and a pack of gum and paid $1.75. jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar nad the cost of a pack of gum.

3C + 1G= 1.75
2C + 4G=2.00

solve.

I know that i have to eliminate the c's or g's but what do i use to do that?

How do you solve when you have two problems together like this?